Which method measures depreciation based on the anticipated life of a structure?

The Age-Life depreciation method is primarily focused on the relationship between a structure's age and its expected lifespan. This method assesses depreciation by determining the total economic life of a property and comparing it to its effective age (the age the property appears to be based on its condition and maintenance). By calculating the ratio of effective age to total economic life, this method provides a systematic way to quantify depreciation, making it valuable for appraising property value accurately.

In contrast, other methods like the Flat depreciation rate apply a uniform percentage over the life of the asset, the Actual Age method assesses depreciation based purely on the property's actual chronological age without considering its condition, and the Effective Age assessment infers a property’s age based on its condition but does not necessarily quantify depreciation in relation to estimated lifespan.